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| author | Wang Lu <wanglu@dapustor.com> | 2021-09-09 06:25:28 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-09-20 22:46:02 +0300 |
| commit | 3a19407913e8e43d6b799a59bc0f6cae889b5446 (patch) | |
| tree | 8e5776fb87a881e1671a396b4d102f566089e127 /drivers/pci/p2pdma.c | |
| parent | e4e737bb5c170df6135a127739a9e6148ee3da82 (diff) | |
| download | linux-3a19407913e8e43d6b799a59bc0f6cae889b5446.tar.xz | |
PCI/P2PDMA: Apply bus offset correctly in DMA address calculation
The bus offset is bus address - physical address, so the calculation in
__pci_p2pdma_map_sg should be: bus address = physical address + bus offset.
Correct the dma_address computation in __pci_p2pdma_map_sg().
Link: https://lore.kernel.org/r/20210909032528.24517-1-wanglu@dapustor.com
Signed-off-by: Wang Lu <wanglu@dapustor.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Diffstat (limited to 'drivers/pci/p2pdma.c')
| -rw-r--r-- | drivers/pci/p2pdma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 50cdde3e9a8b..327882638b30 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -874,7 +874,7 @@ static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap, int i; for_each_sg(sg, s, nents, i) { - s->dma_address = sg_phys(s) - p2p_pgmap->bus_offset; + s->dma_address = sg_phys(s) + p2p_pgmap->bus_offset; sg_dma_len(s) = s->length; } |